19217232257 has 2 divisors, whose sum is σ = 19217232258. Its totient is φ = 19217232256.

The previous prime is 19217232239. The next prime is 19217232323. The reversal of 19217232257 is 75223271291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17690064016 + 1527168241 = 133004^2 + 39079^2 .

It is a cyclic number.

It is not a de Polignac number, because 19217232257 - 2⁶ = 19217232193 is a prime.

It is not a weakly prime, because it can be changed into another prime (19217232217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9608616128 + 9608616129.

It is an arithmetic number, because the mean of its divisors is an integer number (9608616129).

Almost surely, 2^19217232257 is an apocalyptic number.

It is an amenable number.

19217232257 is a deficient number, since it is larger than the sum of its proper divisors (1).

19217232257 is an equidigital number, since it uses as much as digits as its factorization.

19217232257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 41.

The spelling of 19217232257 in words is "nineteen billion, two hundred seventeen million, two hundred thirty-two thousand, two hundred fifty-seven".